docs: def _get_generator_plugins(cls):
          """
          Return a list of classes from external plugins that are used to
          generate checker classes
          """
  
          if not hasattr(cls, 'suite_generators'):
              gens = working_set.iter_entry_points('compliance_checker.generators')
              cls.suite_generators = [x.resolve() for x in gens]
  
          return cls.suite_generators